The use or sensing of time is very diversified; equipment can also be controlled by a _________ where it is turned on at a particular time of day or turned off at a particular time of day.
A _________ is a device that is designed to switch closed contacts open or to switch open contacts closed.
A) real clock; real clock
B) timer; timer
C) timer; real clock
D) real clock; timer
Show Answer
Answer:D
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